Lesson Notes By Weeks and Term - Primary 6

TERM: 3^rd Term

WEEK: 2

CLASS: Primary 6

AGE: 11 years

DURATION: 40 minutes of 2 periods each
DATE:

SUBJECT: Prevocational Studies

TOPIC:       -    How to make disinfectant

SPECIFIC OBJECTIVES: At the end of the lesson, the pupils should be able to

1. Explain the meaning of disinfectant
2. Discuss uses of disinfectants
3. Identify different types of disinfectants
4. List the ingredients used in making disinfectants
5. Explain the procedure in making disinfectants

INSTRUCTIONAL TECHNIQUES: Identification, explanation, playway method, questions and answers, demonstration.

INSTRUCTIONAL MATERIALS: Texapon, Phenol, Chloroxylenol, I.P.A (Isopropanol ), Pine oil, Castor oil, Colorant, Water, bucket, stirring stick

INSTRUCTIONAL PROCEDURES

PERIOD 1 and 2:

NOTE

Meaning of disinfectants, uses of disinfectants, types of disinfectants, ingredients used in making disinfectants and how to make disinfectants

Disinfectants are antimicrobial agents that are applied to the surface of non-living objects to destroy microorganisms that are living on the objects. E.g.- Chlorine bleach, Dettol etc

Uses of disinfectants

1. It helps to protect you from stubborn germs that are resistant to detergents.
2. It can be used for cleaning of surfaces
3. to kill the germs in the air that cause respiratory infections.
4. to prevent the spread of diseases

Types of disinfectants include

1. Alcohol.
2. Chlorine and chlorine compounds.
3. Formaldehyde.
4. Glutaraldehyde.
5. Hydrogen peroxide.
6. Iodophors.
7. Ortho-phthalaldehyde (OPA)
8. Peracetic acid.

Ingredients used in making disinfectants and how to make disinfectants(for 1 litre)

1.Texapon – you will need half (1/2) cup.

2. Phenol – 1 cup.
3. Chloroxylenol 1/2 cup.
4. I.P.A (Isopropanol 1/2 liter.
5. Pine oil 1/2 cup.
6. Castor oil 1/2 cup.
7. Colorant little or as desired.
8. Water 5 tins of milk cup.

Methods

1. Gently pour the texapon into a big empty bowl and dissolve the phenol in it
2. Add the pine oil and stir properly
3. Add chloroxylenol and stir also
4. Add I.P.A (Isopropanol)

5. Add the castor oil and stir properly
6. Pour the water into the content and stir it very well
7. Dissolve the color in water and add to it, mix it properly, and leave to settle for a while before packaging it.

NOTE: The color should be added last. To know if your Dettol is well

formulated, it should be able to form a milky emulsion of oil droplet when it

is diluted in water

EVALUATION:    1. Explain the meaning of disinfectants

2. Enumerate three uses of disinfectants
3. List the different types of disinfectants
4. List the ingredients used in making Dettol
5. How do we make Dettol?

CLASS ACTIVITY: Pupils in small groups, prepare dettol

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the pupils positively and marks their books